Ais Wallenstein[]
Lefiya strongly adores Ais. She has a habit of fantasizing about her, particularly fantasies about being praised. Ais saving Lefiya seems to lead her into becoming a target of obsession for Lefiya. Lefiya is prone to jealousy regarding Ais. For instance, when Tiona informs Lefiya that hugging Ais is Tiona's special privilege in order to tease her, Lefiya was somewhat upset. Moreover, Lefiya would look for opportunities and excuses to malign Bell due to his closeness with Ais.
Other Loki Familia members, like Aki and Raul, tell Lefiya that Ais didn't smile very much until she, Tione, and Tiona joined the Familia.
Tione Hiryute[]
Tione takes on a kind, caring role with relation to Lefiya, giving her advice as a senior adventurer, and discreetly helping Lefiya build her relationships within the Familia, notably with Ais.
Tiona Hiryute[]
Lefiya is often helped emotionally, during the early expeditions of Sword Oratoria, by Tiona and her positive, kind attitude. Tiona also acts as a kind, senior adventurer.
Bell Cranel[]
Lefiya sees Bell as her rival after she found out that he was receiving training from Ais, unable to believe that someone from another Familia had the nerve to be with her. At the time, Bell himself had no idea who she was, and was confused when she declared that she wouldn't lose to him. Despite this, she has become more tolerant of him after the events that they went through on the 18th floor, though she vigorously denied it when Ais mentioned that she was getting along with Bell.
Lefiya has tended to mentally consider him her rival for Ais' affection, and a rival for the effort they put into their work. Lefiya would frequently be proud of her effort and improvement, feeling that she's gained an advantage over Bell in her mental rivalry, only to learn of Bell performing some feat, feel that the scores were even, and be motivated to keep working harder.
The strong rivaly she feels toward Bell, to which derives a tendency of watching him carefully when he's nearby, has led her to know him better than most, among those outside his circle of friends and Familia: when Bell is subjected to Orario's anger for having helped the Xenos, Lefiya is one of the few that, despite not knowing the whole story, refuses to believe that he could have done such a thing without a proper reason.
When Bell was fighting Asterius, Lefiya was moved by Bell's adventure, joining in on the crowd's cheers, shouting to Bell to not lose. After those events, Lefiya was shaking upon reading the news of Bell's ascension to Level 4 before her, thinking she wasn't able to do stuff as he did.
Filvis Challia[]
Lefiya was rejected by Filvis at first and was referred to as Viridis due to Filvis' desire of not wanting to dirty fellow Elves due to the claims that she brought death to whoever went into the dungeon with her. However, Lefiya didn't give up and constantly tried to get closer to her. Eventually, Filvis opened up her heart to Lefiya and began calling her by her name. Filvis also showed Lefiya her Dio Grail magic to allow her to use it. Lefiya was devastated beyond repair when she 'witnessed' Filvis' death. Even when the truth of the fake death was discovered, Lefiya and Filvis had their touching goodbye scene.
Riveria Ljos Alf[]
Lefiya admires Riveria for her knowledge and skill in magic, even using Riveria's own spells to aid her in battle. Riveria seems to hold confidence in Lefiya's capability, acting as her mentor and trainer. Moreover, whereas Raul is expected to succeed Finn, Lefiya is expected to succeed Riveria.